Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 10)

6 Analog Inputs
Example 3
− [Anlg In Config], bit 0 = “0” (Voltage)
− [Speed Ref A Sel] = “Analog In 1”
− [Speed Ref A Hi] = 30 Hz
− [Speed Ref A Lo] = 0 Hz
− [Analog In 1 Hi] = 10V
− [Analog In 1 Lo] = 0V
This is an application that only requires 30 Hz as a maximum output frequency, but is still configured for
full 10 volt input. The result is that the resolution of the input has been doubled, providing 1024 steps
between 0 and 30 Hz.
Example 4
− [Anlg In Config], bit 0 = “1” (Current)
− [Speed Ref A Sel] = “Analog In 1”
− [Speed Ref A Hi] = 60 Hz
− [Speed Ref A Lo] = 0 Hz
− [Analog In 1 Hi] = 20 mA
− [Analog In 1 Lo] = 4 mA
This configuration is referred to as offset. In this case, a 4-20 mA input signal provides 0-60 Hz output,
providing a 4 mA offset in the speed command.
Example 5
− [Anlg In Config], bit 0 = “0” (Voltage)
− [Speed Ref A Sel] = “Analog In 1”
− [Speed Ref A Hi] = 0 Hz
− [Speed Ref A Lo] = 60 Hz
− [Analog In 1 Hi] = 10V
− [Analog In 1 Lo] = 0V
This configuration is used to invert the operation of the input signal. Here, maximum input (10 Volts)
represents 0 Hz and minimum input (0 Volts) represents 60 Hz.
2
4
6
8
10
12
6 0 12 18
Output Hertz
Input Volts
24 30 36 42 48 54 60
4
8
12
16
20
6 0 12 18
Output Hertz
Input mA
24 30 36 42 48 54 60
2
4
6
8
10
6 0 12 18
Output Hertz
Input Volts
24 30 36 42 48 54 60